JPH09259406A - Magnetic head and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic head with a protective coating film preventing the seizing of the head, improving the wear resistance and durability of the head and maintaining its properties over a long period of time. SOLUTION: A coating film is formed on a magnetic head by coating with a mixture of alkoxysilane compds. separately having perfluoro-polyether groups represented by the formula Rf COR1 -R2 -Si(OR3 )3 (I) and the formula (R3 O)3 -Si-R2 CORf2 COR1 -R2 -Si(OR3 )3 (II) with an alkoxysilane compd. having long chain hydrocarbon represented by the formula R4 -Si(OR5 )3 (III). In the formula I, Rf is perfluoro-polyether, R1 is an atom or an atomic group such as O, NH or S, R2 is alkylene and R3 is alkyl. In the formula II Rf is multifunctional perfluoro-polyether, R1 is an atom or an atomic group such as O, NH or S, R2 is alkylene and R3 is alkyl. In the formula III, each of R4 and R5 is alkyl.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head having a coating formed on the magnetic head and a method for manufacturing the same.

[0002]

2. Description of the Related Art To meet the recent demand for high recording density, a magnetic coating material containing very fine magnetic particles and a resin binder is coated on a non-magnetic support to form a so-called magnetic layer. A coating type magnetic recording medium or a thin film type magnetic recording medium in which a magnetic layer is formed on a non-magnetic substrate such as PET (polyethylene terephthalate) by a vacuum deposition method, a plating method or a sputtering method has been developed. Generally, in a magnetic recording medium, especially a magnetic tape, it must be slid at high speed with a magnetic head in the process of recording / reproducing a magnetic signal, and the running at that time must be performed in a smooth and stable state.

However, in magnetic recording / reproducing, the smoothness of the surface of the magnetic layer in the magnetic recording medium is improved in order to reduce the spacing loss and increase the recording density. As a result, the substantial contact area of the magnetic recording medium with the magnetic head becomes large, and a burn-in phenomenon, so-called brown stain, is likely to occur, which leads to a level drop or a problem of durability such as head clogs.

Therefore, in order to solve these problems, a lubricant is internally added to the magnetic layer, but the lubricity is insufficient by itself, and the lubricant may be top-coated on the magnetic layer in some cases. . However, even after the top coating, the lubricant diffuses into the magnetic layer and the concentration of the lubricant on the surface decreases. Especially after aging, there is a problem that the lubricant is exhausted. Therefore, desorbed substances such as a binder or a lubricant containing magnetic powder in the magnetic layer adhere to the magnetic head portion that is in sliding contact with the magnetic recording medium, which is oxidized and cannot be wiped off with an ordinary solvent. This causes a phenomenon called brown stain, which leads to a level reduction during recording and reproduction.

As a solution to this problem, a perfluoropolyether having a polar group dissolved in perfluorocarbon (C _n F _{2n + 2} ), for example, Deck Solvent (manufactured by Energy Corporation) is commercially available, and a magnetic head is used. It is used to remove dirt from the. Furthermore, since perfluoropolyether has a polar group, it is adsorbed to a metal, and it is said that it is less likely to become dirty.

However, when the surface of the magnetic head is rubbed with a solvent such as alcohol, it peels off from the surface, the effect does not last long, and there is a problem in terms of durability. Therefore, it is necessary to develop a lubricant that has a very strong bond with a metal so that it cannot be easily removed by sliding the magnetic head. In addition, a method has been proposed in which the polar group at the terminal of perfluoropolyether is modified to improve the adsorptivity with the magnetic head and prevent the adhesion of dirt. According to this method
Although it is possible to synthesize a perfluoropolyether compound that is soluble in a solvent other than a fluorine-based compound, the lubricant and the head surface do not chemically bond to each other, and therefore the lubricant is still unsatisfactory.

[0007]

As described above, in the field of magnetic recording, this brown stain and deterioration of durability due to head clogs pose a problem, leaving unsatisfactory practical characteristics.

According to the present invention, a magnetic head having a protective coating which prevents seizure of so-called brown stain of the magnetic head and improves its wear resistance, durability and the like, and which lasts for a long time is inexpensive. Is provided to.

[0009]

In the present invention, at least one of alkoxysilane compounds having a perfluoropolyether group represented by the following (general formula 1) and (general formula 2) and the following (general formula A mixture with the alkoxysilane compound having a long-chain hydrocarbon represented by 3) is applied on the magnetic head and heated as necessary to form a film.

(General Formula 1) R _f COR ₁ -R ₂ -Si (OR ₃ ) _{3 wherein} R _f represents a perfluoropolyether group, R ₁
Indicates an atom or an atomic group. R ₂ represents an alkylene group and R ₃ represents an alkyl group. (Formula _{2) (R 3 O) 3} -Si-R 2 COR f2 COR 1 -R 2 -S
i (OR ₃ ) ₃ However, R _f2 represents a polyfunctional perfluoropolyether group. R ₁ represents an atom or an atomic group. Also R
₂ represents an alkylene group and R ₃ represents an alkyl group. (Formula _{3) R 4 -Si (OR 5} ) 3 R 4, R 5 represents an alkyl group.

According to the present invention, an alkoxysilane compound having a perfluoropolyether group, represented by the above (general formula 1) and (general formula 2), and the above (general formula 3)
By coating a mixture of alkoxysilane compounds having a long-chain hydrocarbon on a magnetic head, and heating as needed to form a film, the alkoxysilane compound having a perfluoropolyether group alone. The protective coating could be formed on the magnetic head at a lower cost than when it was used. Also, by forming the above film, it is possible to prevent brown stain of the magnetic head, improve the wear resistance and durability of the magnetic head compared to the conventional one, and maintain the effect for a long time. I was able to do it.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides, in a magnetic head, at least one of alkoxysilane compounds having a perfluoropolyether group represented by (general formula 1) and (general formula 2) and the following (general formula). A mixture of an alkoxysilane compound having a long chain hydrocarbon represented by the formula 3) is applied, and then a heat-cured coating is formed if necessary.

(General formula 1) R _f COR ₁ -R ₂ -Si (OR ₃ ) _{3 wherein} R _f represents a perfluoropolyether group, R ₁
Indicates an atom or an atomic group. R ₂ represents an alkylene group and R ₃ represents an alkyl group. (Formula _{2) (R 3 O) 3} -Si-R 2 COR f2 COR 1 -R 2 -S
i (OR ₃ ) _{3 wherein} R _f2 represents a polyfunctional perfluoropolyether group. R ₁ represents an atom or atomic group such as O, NH and S. R ₂ represents an alkylene group and R ₃ represents an alkyl group. (Formula _{3) R 4 -Si (OR 5} ) 3 R 4, R 5 represents an alkyl group.

That is, according to the present invention, a lubricant solution is applied to a magnetic head, and then, if necessary, heat curing is performed to form a coating film.

The perfluoropolyether group of the present invention, that is, the main chains of R _f and R _f2 are represented by (Structural Formula 1) to (Structural Formula 4).
However, the present invention is not limited to these.

[0016]

Embedded image (Structural Formula 1) F (CF ₂ CF ₂ CF ₂ O) _n

[0017]

Embedded image

[0018]

Embedded image

Further, as the polyfunctional one, there is one shown in the following (structural formula 4).

[Chemical Formula 4] (Structural Formula 4) (OC ₂ F ₄ ) _p (OCF ₂ ) _q

Here, in the chemical structural formula of the perfluoropolyether group, l, m, n, k, p and q are integers of 1 or more. The molecular weight of these perfluoropolyether groups is not particularly limited, but is 600-500.
About 0 is desirable, and considering the solubility in a fluorine-based solvent, its molecular weight is preferably about 600 to 1500.

The film thickness of the coating made of a mixture of an alkoxysilane compound having a perfluoropolyether group and a long-chain alkoxysilane compound is not particularly limited, but if it is too thin, the effect of durability will be a problem. Since it is not preferable from the viewpoint of spacing when it is too thick, the thickness is preferably about 0.5 nm to 50 nm.

The molecular structure of the groups other than the perfluoropolyether group in the above-mentioned (general formula 1) and (general formula 2) is not particularly limited, but it is easy to synthesize in the actual manufacturing process. Depending on the feasibility issue, some types will be decided.

That is, R ₁ is synthetically O, N
Atoms or atomic groups such as H and S are considered. R ₂ is an alkylene group and is not particularly limited structurally and may contain an aromatic ring such as a phenylene group. R ₃ and R _{5 each} represent an alkyl group, which usually has 3 or less carbon atoms, that is, an isopropyl group or a propyl group,
An ethyl group and a methyl group are shown. However, the present invention can also be applied to those having more than 3 carbon atoms. R
_{Although 4} represents an alkyl group or an alkyl group containing an aromatic ring, the number of carbon atoms is not particularly limited. However, in consideration of material availability, it is preferable that the alkyl group has 12 or more and 20 or less carbon atoms.

One of the alkoxysilane compounds having a perfluoropolyether group represented by the above (general formula 1) and (general formula 2) and the long-chain hydrocarbon represented by the above (general formula 3). A method in which a mixture of a mixture of alkoxysilane compounds is dissolved in a solvent is applied to the magnetic head can be performed by a generally used method. For example, it can be applied with a cotton swab or the like, or can be applied by a dipping method. Alternatively, it can be applied using chamois.

One of the alkoxysilane compounds having a perfluoropolyether group represented by the above (general formula 1) and (general formula 2) and the long-chain hydrocarbon represented by the above (general formula 3). As the solvent for dissolving the mixture of alkoxysilane compounds, those conventionally used which can dissolve these compounds can be used, and there is no particular limitation, but when applying using a chamois, a solvent is used. Is preferably a hydrocarbon solvent, and it is particularly desirable to use a perfluorocarbon solvent. A ketone solvent such as methyl ethyl ketone may be used depending on the kind of the alkoxysilane compound.

Further, one of the alkoxysilane compounds having a perfluoropolyether group represented by the above (general formula 1) and (general formula 2) in these solvents and the above (general formula 3). The boiling point of the solution in which the mixture of alkoxysilane compounds having a long-chain hydrocarbon is dissolved is preferably 50 ° C. or higher in consideration of maintenance.

Further, the curing reaction of the protective film can be promoted by adding a catalyst or the like. Examples of the catalyst include acids such as hydrochloric acid, bases such as ammonia, and compounds such as phosphoric acid esters. Further, a ketone-based reaction accelerator such as acetylacetone can be added.

At least one of the alkoxysilane compounds having a perfluoropolyether group represented by the above (general formula 1) and (general formula 2) and the long chain hydrocarbon represented by the above (general formula 3) A film thickness of a solution in which a mixture with an alkoxysilane compound is applied is applied to a magnetic head is too thick, resulting in spacing, which leads to signal deterioration, and when it is too thin, a problem remains in durability,
It is preferably about 0.5 to 50 nm. In addition, for example, with respect to the head clogs, debris from the magnetic tape, that is, the magnetic recording medium accumulates in the magnetic head core part, for example, the ferrite part, and causes spacing, which causes head clogs. The formation of a film is most effective.

Further, after applying as described above, the effect of the protective film is obtained even if it is dried at room temperature,
In particular, the effect of the protective film can be more exerted by heating to 60 ° C. or higher and drying. It is understood that this is because the heating promotes the chemical bonding between the hydroxyl groups on the surface of the ferrite and the alkoxy part of the alkoxysilane compound, thereby increasing the bonding strength.

Specific examples of the present invention will be described below, but the present invention is not limited to these examples.

As the magnetic head applied to the present invention, a general ferrite head, a MIG head, a laminated head, an inductive or MR (magnetoresistive effect) type thin film head, etc. can be used. It is not particularly limited to these.

For example, an MIG head as shown in FIG. 1 (so-called M in which a metal layer is formed in the magnetic gap forming portion) is used.
IG head), for example, TSS (Tilted Send)
ustSputter). In this magnetic head, a pair of magnetic core halves, that is, a first magnetic core half 1 and a second magnetic core half 2 are formed of ferromagnetic oxide, for example, single crystal ferrite. A ferromagnetic metal thin film 3 having a high saturation magnetic flux density such as sendust is continuously formed on a surface of the second magnetic core halves 1 and 2 which is formed by obliquely cutting the joining surface from the front gap forming surface to the back forming surface. Has been formed.

These first and second magnetic core halves 1
2 and 2 are butted against each other via a gap material such as SiO ₂ , and the contact surface of the ferromagnetic metal thin film 3 is a magnetic gap. Non-magnetic materials 4 and 5 are filled in the grooves in which the ferromagnetic metal thin film 3 is formed,
Winding grooves 6 and 7 for controlling the depth of the magnetic gap and winding the coil 8 are formed on the abutting surfaces of the first and second magnetic core halves 1 and 2.

The sliding surface 9 with the magnetic recording medium in the magnetic head having the above-mentioned structure has the above-mentioned (general formula 1).
And a solution of a mixture of any one of the alkoxysilane compounds having a perfluoropolyether group represented by the general formula 2 and the alkoxysilane compound having a long-chain hydrocarbon represented by the general formula 3 above. 0.
It was applied to a thickness of about 5 to 5 nm.

As the magnetic recording medium, a coating type magnetic recording medium was prepared using the materials shown below. Metal powder Magnetic powder (Fe magnetic powder) 100 parts by weight Vinyl chloride-vinyl acetate copolymer 10.5 parts by weight Polyurethane resin 10.5 parts by weight Carbon (antistatic agent) 5 parts by weight Methyl ethyl ketone 150 parts by weight Toluene 150 parts by weight Cyclohexane 100 parts by weight Stearic acid butyl ester 2 parts by weight

The above composition was used as a basic composition, mixed with a ball mill for 24 hours, taken out through a filter, 4 parts by weight of a curing agent was further added, and the mixture was stirred for 30 minutes. This magnetic paint was applied onto a polyethylene terephthalate base having a thickness of 8 μm so that the thickness after drying would be 3 μm,
After magnetic field orientation, it was dried and wound. This was calendered and then cut into a width of 8 mm to prepare a sample tape.

Specific examples will be described below.

Example 1 In Table 1, the alkoxysilane compound of the general formula 1 having the perfluoropolyether group shown in the example 1 and the long-chain hydrocarbon of the general formula 3 were prepared. A mixture having an equimolar ratio with the alkoxysilane compound is dissolved in alcohol to prepare a 2 wt% solution, which is used as the lubricant 1. Here, the perfluoropolyether group R _{f of the} alkoxysilane compound having a perfluoropolyether group in (Table 1) and other functional groups R ₁ ,
The structures of R ₂ , R ₃ and the functional groups R ₄ , R ₅ of the alkoxysilane compound having a long chain hydrocarbon are shown. After applying the lubricant 1 to the TSS type magnetic head with a cotton swab, followed by heating and curing at 150 ° C. for 1 hour, it is divided into one before cleaning with alcohol and one after cleaning with alcohol. And the sample tape was run.

Example 2 in Examples 2-10 (Table 1)
Equimolar ratio of the alkoxysilane compound of (general formula 1) or (general formula 2) having a perfluoropolyether group shown in 10 to the alkoxysilane compound having a long chain hydrocarbon shown in (general formula 3) The mixture is dissolved in alcohol to prepare a 2 wt% solution, which is used as lubricants 2 to 10. Here, the perfluoropolyether group R _f or R _{f2 of the} alkoxysilane compound having a perfluoropolyether group in (Table 1) and other functional groups R ₁ ,
The structures of R ₂ , R ₃ and the functional groups R ₄ , R ₅ of the alkoxysilane compound having a long chain hydrocarbon are shown. The above lubricants 2 to 10 were applied to a TSS magnetic head with a cotton swab, followed by heating and curing at 150 ° C. for 1 hour, and then the sample tape was run by the same method as in Example 1.

[0040]

[Table 1]

[Embodiment 11] The above lubricant 6 was applied to a magnetic head with a cotton swab and then cured at 25 ° C (normal temperature), that is, without heating, and the sample tape was run in the same manner as in Embodiment 1. Let

[Examples 12 to 16] The above lubricant 6 was applied to a magnetic head with a cotton swab, and then 50 ° C and 7 ° C, respectively.
After heating and curing at 0 ° C., 100 ° C., 150 ° C., and 200 ° C. for 1 hour, the sample tape was run in the same manner as in Example 1.

Table 2 shows the heating time (Hr) and heating temperature (° C.) in Examples 11 to 16 above.

[0044]

[Table 2]

Comparative Example 1 The above sample tape was run in the same manner as in Example 1 using a blank magnetic head without forming a protective film.

Comparative Example 2 A lubricant solution prepared by dissolving a perfluoropolyether compound having hydroxyl groups at both ends and a molecular weight of 2000 in perfluorohexane was applied to a magnetic head with a cotton swab to form a protective film. After forming
The sample tape was run in the same manner as in Example 1.

Comparative Example 3 A lubricant solution prepared by dissolving a perfluoropolyether compound having carboxyl groups at both ends in perfluorooctane was applied to a magnetic head with a cotton swab, and then the same method as in Example 1 was applied. The sample tape was run by.

Comparative Example 4 A lubricant of a perfluoropolyether compound having a piperonyl group at both ends was applied to a magnetic head with a cotton swab to form a protective film, and then the same method as in Example 1 was performed. The sample tape was run.

Comparative Example 5 A lubricant solution prepared by dissolving a perfluoropolyether compound having hydroxyl groups at both ends and a molecular weight of 4000 in perfluorohexane was applied to a magnetic head with a cotton swab to form a protective coating. After forming
The sample tape was run in the same manner as in Example 1.

[Comparative Example 6] A lubricant of perfluoropolyether stearate amine salt having carboxyl groups at both ends was applied to a magnetic head with a cotton swab to form a protective film, and then the same procedure as in Example 1 was performed. The sample tape was run by mounting the sample tape on the drum by the method described in 1.

The molecular structures of the perfluoropolyether compounds of Comparative Examples 1 to 6 and their molecular weights are shown in Table 3 below.
Shown in

[0052]

[Table 3]

In each of Examples 1 to 16 and Comparative Examples 1 to 6, sample tapes were prepared using the magnetic head before cleaning with alcohol and the magnetic head after cleaning. The increase in error rate due to the level reduction and the brown stain of the magnetic head of the sample tape after running the test piece were measured at 25 ° C. and 60% relative humidity. Further, the same measurement was carried out for those after storage for 3 days at 40 ° C. and 80% relative humidity. The measurement results are shown before the alcohol cleaning (Table 4).
Table 5 shows the measurement results after alcohol cleaning. Here, the circles in (Table 4) and (Table 5) indicate that the sendust portion of the magnetic head is not dirty,
The mark Δ indicates a slightly soiled state, and the mark x indicates a state in which more than half of the portions are changed.

[0054]

[Table 4]

[0055]

[Table 5]

Examples 1 to 1 in (Table 4) and (Table 5)
When 0 and Comparative Examples 1 to 6 are compared, at least one of the alkoxysilane compounds having a perfluoropolyether group represented by the above (general formula 1) and (general formula 2) and the above (general formula 3) When an alcohol solution of an equimolar ratio of an alkoxysilane compound having a long-chain hydrocarbon shown in the above is applied on a magnetic head and cured by heating at 150 ° C. to form a film, a blank magnetic layer is used. The error rate can be reduced as compared with the case of using a head or a magnetic head having a protective film formed by using the perfluoropolyether compound shown in (Table 3). Particularly, the magnetic head was washed with ethanol. Afterwards, it is possible to reduce the error rate and brown stain, and after storing in a hot and humid environment Can have it can be seen that the obtained good results.

Further, as shown in Examples 11 to 16 in (Table 4) and (Table 5), the lubricant 6 was applied to the magnetic head with a cotton swab, and then cured at 25 ° C. (normal temperature), that is, without heating. Coated magnetic head, or 50 ℃,
When a magnetic head having a coating formed by heating at 70 ° C., 100 ° C., 150 ° C., and 200 ° C. for 1 hour each was used, a blank magnetic head or the perfluoro shown in (Table 3) was used in each case. The error rate can be reduced as compared with the case of using a magnetic head having a protective film formed using a polyether compound, and especially after cleaning the magnetic head with ethanol, the error rate and brown stain are reduced. It can be seen that good results can be obtained even after storage in a hot and humid environment. Further, it is understood that these effects do not depend on the curing temperature of the coating. In addition,
Here, the temperature for heating the coating may be room temperature or higher, but it may vary depending on conditions such as the type of the magnetic head due to manufacturing restrictions of the magnetic head.
It becomes ~ 500 ° C.

[Examples 17 to 21] Fruits in the above (Table 1)
Having the perfluoropolyether group shown in Example 1
Of the alkoxysilane compound of (general formula 1), (general formula
Alkoxysilane compound having long-chain hydrocarbon shown in 3)
Weight ratio to product (R in the following (Table 6)_f/ R
_FourDisplay as. ) Is changed by more than 1/4 and mixed
And dissolve in alcohol to make a 2 wt% solution.
A protective film was formed in the same manner as in Example 1 and the above
The pull tape was run.

[Comparative Example 7] In Example 1 in the above (Table 1)
Having the perfluoropolyether group shown (general formula
The alkoxysilane compound of 1) is represented by (general formula 3)
For alkoxysilane compounds with long chain hydrocarbons
Weight ratio (R in the following (Table 7))_f/ R _FourAs table
Show. ) To 1/5, that is, a value smaller than 1/4
Change and dissolve in alcohol to make 2wt% solution
Then, a protective film is formed by the same method as in Example 1,
The sample tape was run.

Comparative Example 8 The long-chain hydrocarbon represented by (general formula 3) of the alkoxysilane compound of (general formula 1) having the perfluoropolyether group shown in Example 1 in the above (Table 1) The weight ratio (expressed as R _f / R ₄ in the following (Table 7)) with respect to the alkoxysilane compound having 0 is 0, that is, the alkoxysilane compound having the perfluoropolyether group (general formula 1) is added at all. Of the alkoxysilane compound having a long-chain hydrocarbon represented by the general formula (3)
A protective coating was formed as a wt% solution by the same method as in Example 1, and the sample tape was run.

Examples 17-21 and Comparative Examples 7 and 8
At 25 ° C., the increase in error rate with the level reduction of the sample tape after running and the brown stain of the magnetic head were measured at 25 ° C. and 60% relative humidity. Further, the same measurement was carried out for those after storage for 3 days at 40 ° C. and 80% relative humidity. These measurement results are shown below (Table 6) and (Table 7).
Shown in

[0062]

[Table 6]

[0063]

[Table 7]

When the measurement results of Examples 17 to 21 in (Table 6) and Comparative Examples 7 and 8 in (Table 7) are compared, the perfluoropolyether group shown in Example 1 is contained (general formula). The weight ratio of the alkoxysilane compound of 1) to the alkoxysilane compound having a long-chain hydrocarbon represented by (general formula 3) (R _f / R in the following (Table 6))
Display as ₄ . ) Is mixed at a rate of ¼ or more, the alkoxysilane compound of (general formula 1) having a perfluoropolyether group shown in Example 1,
The weight ratio (expressed as R _f / R ₄ in the following (Table 7)) to the alkoxysilane compound having a long-chain hydrocarbon represented by (general formula 3) is 1/5, that is, 1
When the value is changed to a value smaller than / 4, and no alkoxysilane compound of (general formula 1) having a perfluoropolyether group is added at all, only an alkoxysilane compound having a long-chain hydrocarbon shown in (general formula 3) It was possible to reduce the error rate as compared with the case where the magnetic recording medium was used, and in particular, it was possible to reduce the error rate and the brown stain after the magnetic head was stored in a hot and humid environment.

Thus, the weight ratio of the alkoxysilane compound having a perfluoropolyether group to the alkoxysilane compound having a long-chain hydrocarbon is 1
When mixed at / 4 or more, the error rate and the brown stain can be reduced and a good magnetic head can be obtained, but when the ratio of the alkoxysilane compound having a perfluoropolyether group is less than this ratio. Have found that these values do not give good results.

Further, since the alkoxysilane compound having a long chain hydrocarbon can be obtained at a lower cost than the alkoxysilane compound having a perfluoropolyether group, the perfluoropolyalkenyl compound having a long chain hydrocarbon is used. By setting the weight ratio with respect to the alkoxysilane compound having an ether group to be less than 3/4, an inexpensive lubricant can be obtained and the error rate can be reduced, and in particular, the magnetic head is stored in a hot and humid environment. After that, the error rate and the brown stain could be reduced.

In the above-mentioned embodiment, the case of using the coating type magnetic recording medium as the sample tape,
The present invention is not limited to this and can be applied to a metal thin film type magnetic recording medium. The magnetic head is not limited to the TSS type magnetic head, and the present invention can be applied to other types of magnetic heads.

[0068]

INDUSTRIAL APPLICABILITY According to the present invention, an alkoxysilane compound having a perfluoropolyether group, represented by the above (general formula 1) and (general formula 2), and the above (general formula 3)
By coating a mixture of an alkoxysilane compound having a long-chain hydrocarbon represented by on a magnetic head and heating it as necessary to form a film, it is possible to reduce the error rate and Brown stain, It was possible to maintain these effects even after storage in a hot and humid environment.

Further, by forming the above film,
The protective coating could be formed on the magnetic head at a lower cost than when the alkoxysilane compound having a perfluoropolyether group was used alone. Also, by forming the above film, it is possible to prevent brown stain of the magnetic head, improve the wear resistance and durability of the magnetic head compared to the conventional one, and maintain the effect for a long time. I was able to do it.

Further, by forming the above film,
It has become possible to easily remove the dirt attached to the magnetic head. Further, it has become possible to reduce wear of the magnetic head, prevent re-adhesion of magnetic powder and the like, and maintain its effect. Cleaning of the magnetic head has become easier and maintenance of the equipment has become smoother.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an example of a magnetic head according to the present invention.

[Explanation of symbols]

1 1st magnetic core, 2 2nd magnetic core, 3 ferromagnetic metal thin film, 4, 5 non-magnetic material, 6, 7 winding groove, 8
Coil, 9 sliding surface

Claims (3)

[Claims] 1. A long-chain hydrocarbon represented by the following (general formula 3) and at least one of alkoxysilane compounds having a perfluoropolyether group represented by the following (general formula 1) and (general formula 2): A magnetic head, characterized in that a mixture of an alkoxysilane compound having a is coated on the magnetic head to form a film. (General Formula 1) R _f COR ₁ —R ₂ —Si (OR ₃ ) ₃ However, R _f represents a monofunctional perfluoropolyether group, and R ₁ represents an atom or an atomic group. R ₂ represents an alkylene group and R ₃ represents an alkyl group. (Formula _{2) (R 3 O) 3} -Si-R 2 COR f2 COR 1 -R 2 -S
i (OR ₃ ) _{3 wherein} R _f2 represents a polyfunctional perfluoropolyether group. R ₁ represents an atom or an atomic group. Also R ₂
Represents an alkylene group, and R ₃ represents an alkyl group. (Formula _{3) R 4 -Si (OR 5} ) 3 R 4, R 5 represents an alkyl group. 2. An alkoxysilane compound having a perfluoropolyether group represented by the above (general formula 1) and (general formula 2) and an alkoxysilane compound having a long chain hydrocarbon represented by the above (general formula 3). 2. The magnetic head according to claim 1, wherein the mixing ratio of and is 1/4 or more in terms of weight ratio. 3. An alkoxysilane compound having a perfluoropolyether group represented by the following (general formula 1) and (general formula 2) and an alkoxysilane compound having a long chain hydrocarbon represented by the following (general formula 3). Is applied to the magnetic head, dried and cured at room temperature or higher,
A method of manufacturing a magnetic head, which comprises forming a coating film. (General Formula 1) R _f COR ₁ —R ₂ —Si (OR ₃ ) ₃ However, R _f represents a monofunctional perfluoropolyether group, and R ₁ represents an atom or an atomic group. R ₂ represents an alkylene group and R ₃ represents an alkyl group. (Formula _{2) (R 3 O) 3} -Si-R 2 COR f2 COR 1 -R 2 -S
i (OR ₃ ) _{3 wherein} R _f2 represents a polyfunctional perfluoropolyether group. R ₁ represents an atom or an atomic group. Also R ₂
Represents an alkylene group, and R ₃ represents an alkyl group. (Formula _{3) R 4 -Si (OR 5} ) 3 R 4, R 5 represents an alkyl group.